nfs: Remove invalid tk_pid from debug message

Before rpc_run_task(), tk_pid is uninitiated as 0 always.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 75a874f..6f228b5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -8150,9 +8150,8 @@
 	struct rpc_task *task;
 	int status = 0;
 
-	dprintk("NFS: %4d initiating layoutcommit call. sync %d "
-		"lbw: %llu inode %lu\n",
-		data->task.tk_pid, sync,
+	dprintk("NFS: initiating layoutcommit call. sync %d "
+		"lbw: %llu inode %lu\n", sync,
 		data->args.lastbytewritten,
 		data->args.inode->i_ino);